GRE历年题目解析

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1、14-7-2710:15PM第一：我用的这套gre历年真题是陈琦团队整理的，如有不妥，请告知我，随时撤下。第二：按照这套真题的顺序，由简入难，从最简单的level1开始，我将努力分析每篇阅读，并及时发上来，但是其中有些文章肯定会有分析错误，所以请大家帮我提出来，大家一起讨论，这才是我发这个贴的主要目的。第三：分析当中涉及一些概念:TW主题词，TS主题句，KW论点，abcdefg….都为说明性内容或者论据。1.Themoleculesofcarbondioxide1Themoleculesofcarbondioxidei

2、ntheEarth’satmosphereaffecttheheatbalanceoftheEarthbyactingasaone-wayscreen.2Althoughthesemoleculesallowradiationatvisiblewavelengths,wheremostoftheenergyofsunlightisconcentrated,topassthrough,theyabsorbsomeofthelonger-wavelength,infraredemissionsradiatedfromtheEarth’

3、ssurface,radiationthatwouldotherwisebetransmittedbackintospace.3FortheEarthtomaintainaconstantaveragetemperature,suchemissionsfromtheplanetmustbalanceincomingsolarradiation.4Iftherewerenocarbondioxideintheatmosphere,heatwouldescapefromtheEarthmuchmoreeasily.5Thesurfac

4、etemperaturewouldbesomuchlowerthattheoceansmightbeasolidmassofice.1Today,however,thepotentialproblemistoomuchcarbondioxide.2Theburningoffossilfuelsandtheclearingofforestshaveincreasedatmosphericcarbondioxidebyabout15percentinthelasthundredyears,andwecontinuetoaddcarbo

5、ndioxidetotheatmosphere.3Couldtheincreaseincarbondioxidecauseaglobalriseinaveragetemperature,andcouldsucharisehaveseriousconsequencesforhumansociety?4Mathematicalmodelsthatallowustocalculatetheriseintemperatureasafunctionoftheincreaseindicatethattheanswerisprobablyyes

6、.1Underpresentconditionsatemperatureof-18℃canbeobservedatanaltitudeof5to6kilometersabovetheEarth.2Belowthisaltitude(calledtheradiatinglevel),thetemperatureincreasesbyabout6℃perkilometerapproachingtheEarth’ssurface,wheretheaveragetemperatureisabout15℃.3Anincreaseinthea

7、mountofcarbondioxidemeansthattherearemoremoleculesofcarbondioxidetoabsorbinfraredradiation.4Asthecapacityoftheatmospheretoabsorbinfraredradiationincreases,theradiatinglevelandthetemperatureofthesurfacemustrise.1Onemathematicalmodelpredictsthatdoublingtheatmosphericcar

8、bondioxidewouldraisetheglobalmeansurfacetemperatureby2.5℃.2Thismodelassumesthattheatmosphere’srelativehumidityremainsconstan